adding notes :
the M5stickc plus uses an AXP192 for power management (including display), all the functions to initialise it are inside the M5StickCPlus but you can't call this library in same time as TFT_eSPI.h.
you will have to copy AXP192.h & AXP192.cpp from the M5StickCPlus lib and put it in your project (change the names).
If you have a M5 project loaded in your stick and then upload a sketch using TFT_eSPI, it will work the first time as the display is already power on from the previous m5 sketch but the display won't turn back on on the next restart unless you init the AXP192 like explained.
hope it helps anyone!